<template>
  <div>     
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>参数列表</el-breadcrumb-item>
    </el-breadcrumb>

    <!-- 卡片视图区域 -->
    <el-card>
      <el-alert show-icon title="注意:只允许为第三级分类设置相关参数!" type="warning" :closable="false">

      </el-alert>
      <!-- 选择商品分类 -->
      <el-row class="cat_opt">
        <el-col>
          <span>选择商品分类：</span>
          <!-- 选择商品分类的级联选择框 -->
          <el-cascader
            v-model="selectedCateKeys"
            :options="catelist"
            :props="{ expandTrigger: 'hover',
             ...cateProps }"
            @change="handleChange"></el-cascader>
        </el-col>
      </el-row>
      <!-- Tab 页签区域 -->
      <el-tabs v-model="activeName" @tab-click="handleTabClick">
        <el-tab-pane label="动态参数" name="many">
          <el-button type="primary" size="mini" :disabled="isBtnDisabled" @click="addParams">添加参数</el-button>
          <!-- 动态参数表格渲染 -->
          <el-table :data="manyTableData" border stripe>
            <el-table-column type="expand">
              <!-- 展开行里的参数 -->
              <template slot-scope="scope">
                <!-- 循环渲染tag标签 -->
                <el-tag v-for="(item , i) in scope.row.attr_vals" :key="i" closable @close="handleClose(i, scope.row)">{{item}}</el-tag>
                <!-- 在按钮后面添加new tag  -->
                <el-input
                  class="input-new-tag"
                  v-if="scope.row.inputVisible"
                  v-model="scope.row.inputValue"
                  ref="saveTagInput"
                  size="small"
                  @keyup.enter.native="handleInputConfirm(scope.row)"
                  @blur="handleInputConfirm(scope.row)">
                </el-input>
                <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
              </template>
            </el-table-column>
            <el-table-column type="index"></el-table-column>
            <el-table-column label="参数名称" prop="attr_name"></el-table-column>
            <el-table-column label="操作">
              <template slot-scope="scope">
                  <el-button type="primary" size="mini" icon="el-icon-edit" @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                  <el-button type="danger" size="mini" icon="el-icon-delete" @click="removeParams(scope.row.attr_id)">删除</el-button>
              </template>
            </el-table-column>
          </el-table>
          <!-- 静态参数表格渲染 -->
  
        </el-tab-pane>
        <el-tab-pane label="静态属性" name="only">
          <el-button type="primary" size="mini" :disabled="isBtnDisabled" @click="addParams">添加属性</el-button>
          <!-- 静态参数表格渲染 -->
          <el-table :data="onlyTableData" border stripe>
            <el-table-column type="expand">
              <!-- 展开行里的参数 -->
              <template slot-scope="scope">
                <!-- 循环渲染tag标签 -->
                <el-tag v-for="(item , i) in scope.row.attr_vals" :key="i" closable @close="handleClose(i, scope.row)">{{item}}</el-tag>
                <!-- 在按钮后面添加new tag  -->
                <el-input
                  class="input-new-tag"
                  v-if="scope.row.inputVisible"
                  v-model="scope.row.inputValue"
                  ref="saveTagInput"
                  size="small"
                  @keyup.enter.native="handleInputConfirm(scope.row)"
                  @blur="handleInputConfirm(scope.row)">
                </el-input>
                <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
              </template>
            </el-table-column>
            <el-table-column type="index"></el-table-column>
            <el-table-column label="属性名称" prop="attr_name"></el-table-column>
            <el-table-column label="操作">
              <template slot-scope="scope">
                  <el-button type="primary" size="mini" icon="el-icon-edit" @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                  <el-button type="danger" size="mini" icon="el-icon-delete" @click="removeParams(scope.row.attr_id)">删除</el-button>
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>
      </el-tabs>
    </el-card>

    <!-- 添加参数显示对话框 -->
    <el-dialog
      :title="'添加' + titleText"
      :visible.sync="addParamsDialogVisible"
      width="50%"
      @close="addDialogClosed">
      <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px">
        <el-form-item :label="titleText" prop="attr_name">
          <el-input v-model="addForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <span span slot="footer" class="dialog-footer">
        <el-button @click="addParamsDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="addParams1">确 定</el-button>
      </span>
    </el-dialog>
    <!-- 编辑修改对话框 -->
      <el-dialog
      :title="'修改' + titleText"
      :visible.sync="editParamsDialogVisible"
      width="50%"
      @close="editDialogClosed">
      <el-form :model="editForm" :rules="editFormRules" ref="editFormRef" label-width="100px">
        <el-form-item :label="titleText" prop="attr_name">
          <el-input v-model="editForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <span span slot="footer" class="dialog-footer">
        <el-button @click="editParamsDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="editParams1">确 定</el-button>
      </span>
    </el-dialog>
  </div>
</template>

<script>
export default {
  data() {
    return {
      catelist:[],
      // 级联选择框的配置对象
      cateProps:{
        value:'cat_id',
        label:'cat_name',
        children:'children'
      },
      // 级联选择框双向绑定到的数组
      selectedCateKeys:[],
      // 被激活的页签的名称，默认选第一个
      activeName:'many',
      // 动态表格的数据
      manyTableData:[],
      // 静态表格的数据
      onlyTableData:[],
      // 添加参数对话框是否显示
      addParamsDialogVisible:false,
      // 添加参数的表单对象 和 规则
      addForm:{
        attr_name:''
      },
      addFormRules:{
        attr_name:[
          {
            required:true,
            message:'请输入参数名称',
            trigger:'blur'
          }
        ]
      },
      editParamsDialogVisible:false,
      // 修改的表单数据对象
      editForm:{},
      // 修改表单的验证规则对象
      editFormRules:{

      },
      // 控制按钮与文本框的切换显示
      // 文本框的内容默认为空

    }
  },
  created() {
    this.getCateList()
  },
  methods: {
    async getCateList(){
     const{data:res} = await this.$http.get('categories')
     this.catelist = res.data
    },
    // 级联选择框选中项发生变化时触发的函数
    async handleChange(){
      this.getParamsData()
    },
    // 页签点击触发的函数
    handleTabClick(){
      this.getParamsData()
    },
    // 获取参数列表的数据
    async getParamsData(){
      if(this.selectedCateKeys.length !== 3){
        this.selectedCateKeys = [],
        this.manyTableData = [],
        this.onlyTableData = []
        return
      }
      // 当选中三级分类时，根据所选分类的ID，和当前所处的面板获取对应的参数
      const {data: res} = await this.$http.get(`categories/${this.cateId}/attributes`,
      {params:{sel : this.activeName}})
      
      // 因为有两个表格，根据各自的activeName来判断当前是那个表，再取对应的数据
      res.data.forEach(item => {
        item.attr_vals = item.attr_vals ? item.attr_vals.split(' ') : []
        item.inputVisible = false
        item.inputValue = ''
      })
      console.log(res.data);
      if(this.activeName === 'many'){
        this.manyTableData = res.data
      }else{
        this.onlyTableData = res.data
      }
    },
    addParams(){
      this.addParamsDialogVisible =true
    },
    // 监听添加对话框的关闭事件
    addDialogClosed(){
      this.$refs.addFormRef.resetFields()
    },
    addParams1(){
      this.$refs.addFormRef.validate(async valid => {
        if(!valid) return
        const {data: res} = await this.$http.post(`categories/${this.cateId}/attributes`,
        {
          attr_name:this.addForm.attr_name,
          attr_sel:this.activeName
        })
        if(res.meta.status !== 201){
          return this.$message.error('添加参数失败')
        }
        this.$message.success('添加参数成功！')
        this.addParamsDialogVisible = false
        this.getParamsData()
      })
    },
    // 点击按钮展示修改对话框
    async showEditDialog(attr_id){
      const {data: res} = await this.$http.get(`categories/${this.cateId}/attributes/${attr_id}`,
      {params:{attr_sel: this.activeName}})

      this.editForm = res.data
      this.editParamsDialogVisible = true
    },
    // 重置修改的表单
    editDialogClosed(){
      this.$refs.editFormRef.resetFields()
    },
    // 点击按钮，修改参数信息
    editParams1(){
      this.$refs.editFormRef.validate(async valid => {
        if(!valid) return
       const {data: res} = await this.$http.put(`categories/${this.cateId}/attributes/${this.editForm.attr_id}`,
        {
          attr_name:this.editForm.attr_name,
          attr_sel:this.activeName
        })
        if(res.meta.status !== 200) {
          return this.$message.error('修改参数失败')
        }
        this.$message.success('修改参数成功！')
        this.getParamsData()
        this.editParamsDialogVisible=false
      })
    },
    async removeParams(attr_id){
      const confirmResult =await this.$confirm('此操作将永久删除该分类, 是否继续?', '提示', {
          confirmButtonText: '确定',
          cancelButtonText: '取消',
          type: 'warning'
        }).catch(err => err)
      if (confirmResult !== 'confirm') {
        return this.$message.info('已取消删除操作!')
      }
      const {data:res} = await this.$http.delete(`categories/${this.cateId}/attributes/${attr_id}`)
      this.$message.success('删除参数成功！')
      this.getParamsData()
    },
    // 文本框失去焦点或者按下回车触发的函数
    // trim()去除字符串两端的空格，去除完后若为空，给里面重置
    async handleInputConfirm(row){
      if(row.inputValue.trim().length === 0){
        row.inputValue = ''
        row.inputVisible = false
        return
      }
      // 输出不为空，做数据请求 添加参数的后续处理
      row.attr_vals.push(row.inputValue.trim())
      row.inputValue = ''
      row.inputVisible = false
      // 发起请求保存在数据库里
      this.saveAttrVals(row)

    },
    async saveAttrVals(row){
      const {data: res} = await this.$http.put(`categories/${this.cateId}/attributes/${row.attr_id}`,
      {
        attr_name:row.attr_name,
        attr_vals:row.attr_vals.join(''),
        attr_sel:row.attr_sel
      })
      if(res.meta.status !== 200){
        return this.$message.error('修改参数项失败')
      }
      this.$message.success('修改参数项成功！')
    },
    // 点击newtag 切换的到输入框触发的函数
    showInput(row){
      row.inputVisible = true
      // 让文本 在鼠标离开后自动获得焦点
      // $nextTick就是当页面元素重新被渲染之后触发的函数里的回调
      // 如果不在nextTick里，此时页面的元素还没加载完，拿不到会报错
      this.$nextTick(_ => {
          this.$refs.saveTagInput.$refs.input.focus();
        });
    },
    // 删除关闭tag时候发生的请求以及保存到数据库
    handleClose(i, row){
      row.attr_vals.splice(i, 1)
      this.saveAttrVals(row)
    }
  },
  computed:{
    // 当前按钮需要被禁用则返回true，根据联级是否为3
    isBtnDisabled(){
      if(this.selectedCateKeys.length !== 3){
        return true
      }
      return false
    },
    cateId(){
      if(this.selectedCateKeys.length === 3){
        return this.selectedCateKeys[2]
      }
      return null
    },
    titleText(){
      if(this.activeName === 'many'){
        return '动态参数'
      }
      return '静态属性'
    }
  }
}
</script>

<style lang="less" scoped>
.cat_opt{
  padding: 15px;
}
.el-tag{
  margin: 10px;
}
.input-new-tag{
  width: 120px;
}
</style>